#define WHITE_TXT 0x7
#define BLUE_TXT 0x09

extern void init_screen_text();
extern void clear_screen_text();
extern void set_attribute_text(unsigned char forecolor, unsigned char backcolor);
extern void move_cursor();
extern void scroll();
extern void kputch(unsigned char c);
extern void kputs(unsigned char* s);
extern void kputhexb(unsigned char h);
